This document describes the Uludağ Enclosure Cooling Units, focusing on their digital thermostat, settings, and operational parameters.
Function Description
The Uludağ Enclosure Cooling Units are designed to manage temperature within enclosures, primarily for cooling applications. The core of the system is a digital thermostat that allows users to monitor and control the cooling process. It features a clear digital display showing the current temperature and various indicators for operational status. The device supports both cooling and heating modes, although cooling is the primary function. It also incorporates alarm functionalities to alert users of critical conditions such as sensor breaks or temperature limit exceedances. The system can be integrated into Modbus communication networks, allowing for remote monitoring and control of its parameters and status.
Important Technical Specifications
The device's digital thermostat, identified as ESM-3773N, provides real-time temperature readings and operational feedback. Key technical specifications include:
Temperature Control Parameters:
- Minimum Temperature Set1 Value (SLI): Default 26.0°C. Adjustable from 26.0°C up to the Maximum Temperature Set Value. Modbus Address: 40002.
- Maximum Temperature Set1 Value (SHI): Default 99.0°C. Adjustable from the Minimum Temperature Set Value up to 99.9°C. Modbus Address: 40003.
- Hysteresis Parameter for Compressor Output (HSF): Default 4.0°C. Adjustable from 0.1°C to 10.0°C. Modbus Address: 40004.
- Cabinet Sensor Offset Parameter (OF1): Default 0°C. Adjustable from -10.0°C to 10.0°C. Modbus Address: 40005.
- Condenser Sensor Offset Parameter (OF2): Default 4.0°C. Adjustable from -10.0°C to 10.0°C, observed if the Condenser sensor selection parameter (SEn) is 1. Modbus Address: 40006.
- Evaporator Sensor Offset Parameter (OF3): Default 4.0°C. Adjustable from -10.0°C to 10.0°C, observed if the Evaporator sensor selection parameter (SEn) is 1. Modbus Address: 40007.
Operational Parameters:
- Waiting Parameter for Elevator (ASA): Default 0. Adjustable from 0 to 1. If set to 1, the system operates for 58 minutes and stops for 2 minutes, during which the compressor and fan are stopped. Modbus Address: 40008.
- Evaporator and Condenser Sensor Selection Parameter (SEn): Default 1. Allows selection between inactive or active evaporator and condenser sensors. Modbus Address: 40009.
- Compressor Operating Type Parameter (HCS): Default 0 (Cooling). Can be set to Cooling or Heating. Modbus Address: 40010.
- Decimal Separator Enabling Parameter (P.d): Default 1 (Enable). Can be set to Disable or Enable. Modbus Address: 40011.
- Digital Input Type Selection Parameter (P.o): Default 2 (Door input). Options include Inactive, Discharge input, and Door input. Modbus Address: 40012.
- Filter Time of Digital Inputs (F.t): Default 0 seconds. Adjustable from 0 to 10 seconds, for protection against electrical contact debounce or short signals. Modbus Address: 40013.
- Digital Input Contact Selection Parameter (C.S): Default 1 (NC "normally close"). Options include NO "normally open" and NC "normally close". Modbus Address: 40014.
- Compressor Start-Start Delay Parameter (C.Sd): Default 0 minutes. Adjustable from 0 to 20 minutes. This delay ensures a minimum time between compressor activations. Modbus Address: 40015.
- Minimum Compressor ON Time Parameter (C.on): Default 0 minutes. Adjustable from 0 to 20 minutes. This delay ensures a minimum ON time for the compressor before deactivation. Modbus Address: 40016.
- Minimum Compressor OFF Time Parameter (F.C): Default 0 minutes. Adjustable from 0 to 20 minutes. This delay ensures a minimum OFF time for the compressor before activation. Modbus Address: 40017.
- Cooling Outdoor Fan Active Parameter (oEn): Default 0 (Cooling outdoor passive). If set to 1 (Cooling outdoor active) and the outdoor temperature is lower than the "oSt" parameter, cooling is managed via the discharge output instead of the compressor. Modbus Address: 40018.
- Cooling Outdoor Temperature High Limit Parameter (oSH): Default 10.0°C. If "oEn" is 1 and outdoor temperature exceeds this value, cooling via discharge output is prevented. Modbus Address: 40019.
- Cooling Outdoor Temperature Low Limit Parameter (oSL): Default -9.9°C. If "oEn" is 1 and outdoor temperature falls below this value, cooling via discharge output is prevented. Modbus Address: 40020.
- Cooling Cabin Temperature High Limit Parameter (C.CH): Default 35.0°C. If "oEn" is 1 and cabin temperature exceeds this value, cooling via discharge output is prevented. Modbus Address: 40021.
- High Temperature Alarm Active Parameter (A.on): Default 0 (High temperature alarm passive). If set to 1, high temperature alarm control is active. Modbus Address: 40022.
- High Temperature Alarm Temperature Set Parameter (A.St): Default 43.0°C. If cabin temperature exceeds this value, the alarm relay activates, and "Er4" is displayed. Modbus Address: 40023.
- Baud Rate Parameter (b.r): Default 0 (9600). Selectable baud rates for Modbus communication: 9600, 19200, 38400, 57600, 115200. Modbus Address: 40024.
- Slave ID Parameter (S.Id): Default 1. Adjustable from 1 to 255 for Modbus communication. Modbus Address: 40025.
Status Parameters (Modbus Read-Only):
- AIN1 (Cabin temperature sensor value): Modbus Address: 30001.
- AIN2 (Condenser temperature sensor value): Modbus Address: 30002.
- AIN3 (Evaporator temperature sensor value): Modbus Address: 30003.
- I/O Status: Modbus Address: 30004 (bits for Digital input, Compressor relay output, Fan relay output, Discharge relay output, Alarm relay output status).
- Alarm Status: Modbus Address: 30005 (bits for Sb1, Sb2, Sb3, Er1, Er2, Er3, Er4, OFF mode, Aın alarms).
Usage Features
The Uludağ Enclosure Cooling Units are designed for user-friendly operation with a digital thermostat and intuitive controls.
Digital Thermostat Interface:
- Display: Shows the current temperature (e.g., 20.0°C) and various status indicators.
- LED Indicators:
- Evap. Error Led: Indicates an error related to the evaporator.
- Cond. Error Led: Indicates an error related to the condenser.
- Cooling Active Led: Indicates when the cooling function is active.
- Buttons:
- Increment (Up Arrow) and Decrement (Down Arrow) Buttons: Used to adjust parameter values. Holding them for 3 seconds in the main operation screen displays the 1st menu parameters.
- R (Reset) Button: Holding for 3 seconds in any menu screen displays the main operation screen. Holding for 3 seconds in the main operation screen sends the device to OFF mode.
- SET Button: Holding for 3 seconds in the main operation screen sends the device to Compressor Set changing mode. Holding both Reset and Set buttons for 3 seconds displays the 2nd menu parameters.
- Menu Navigation:
- Pressing any button on the main menu screen displays the main operation screen.
- Pressing and holding increment/decrement buttons for 3 seconds from the main operation screen enters the 1st menu parameters.
- Pressing and holding the SET button for 3 seconds from the main operation screen enters the Compressor Set changing mode.
- Pressing and holding both R and SET buttons for 3 seconds from the main operation screen enters the 2nd menu parameters.
- Factory Settings: The device can be reset to factory settings by powering it on while holding down both the R and SET buttons.
Modbus Communication:
- The device supports Modbus communication, allowing it to be integrated into larger control systems.
- Users can read and write parameters (e.g., temperature set points, offsets) and monitor the device's status (e.g., sensor values, alarm states) remotely.
- Baud rate and Slave ID are configurable to match network requirements.
Maintenance Features
The device includes several features to aid in maintenance and troubleshooting:
Failure Messages: The digital thermostat displays specific error codes to indicate various issues, facilitating quick diagnosis.
- Sb1 (Cabinet sensor break): Compressor stops, alarm relay activated.
- Sb2 (Condenser sensor break): Compressor stops, alarm relay activated.
- Sb3 (Evaporator sensor break): Compressor stops, alarm relay activated.
- Er1 (Evaporator limit alarm): Occurs if the evaporator sensor value does not decrease by more than 3°C within 15 minutes of compressor operation. Compressor stops, alarm relay activated, evaporator error LED turns on.
- Er2 (Condenser sensor high limit alarm): Occurs if the condenser sensor value exceeds 75°C. Compressor stops, alarm relay activated, condenser error LED turns on.
- Er3 (Condenser sensor low limit alarm): Occurs if the condenser sensor value falls below 3°C. Compressor stops, alarm relay activated, condenser error LED turns on.
- Er4 (Cabin sensor high limit alarm): Occurs if the cabin sensor value is greater than the "A.St" parameter. Alarm relay activated. Alarm control is active if "A.on" is 1.
- OFF (Device OFF mode): Compressor and fan stop.
- Aın (Door open alarm): Compressor and fan stop.
Sensor Monitoring: The Modbus interface allows continuous monitoring of cabin, condenser, and evaporator sensor values (AIN1, AIN2, AIN3), which is crucial for preventive maintenance and performance analysis.
Configurable Delays and Limits: Parameters like compressor start-start delay, minimum ON/OFF times, and temperature limits help protect the compressor and extend its lifespan by preventing rapid cycling and operation outside safe ranges.
Digital Input Monitoring: The I/O status (Modbus Address 30004) provides information on digital input status (e.g., door open/closed), allowing for quick identification of external triggers or faults.
Reset Functionality: The ability to reset to factory settings provides a straightforward method to restore default configurations, which can be useful after troubleshooting or when reconfiguring the device.
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